High School - Earned four varsity letters in track and cross country for Loyola HS ... Served as team captain his junior and senior year ... Member of two state champion cross country teams ('08/'10) ... Team won the Nike Track National championship in 2011 ... Ran on the 2011 4xmile New Balance national champion team ... Mission League champion in 800m and 4x400m ... Member of school record-breaking relays in the DMR and 4xmile ... Also helped set a Mt. SAC Relays DMR record ... Prep bests of 1:52.3 in the 800m, 4:13.26 in the 1600m and 9:14.57 in the 3200m.

Personal - Born December 19, 1992 in Los Angeles, CA ... Son of Bill and Monica Kostelnik ... Has one brother, James, who competes for Duke, and one sister, Claire ... Cousin Michael Stember is an Olympian and ran at Stanford ... Pre-Business/Economics major.